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Method for embedding and extracting multiple zero watermarks of digital image

A digital watermarking and digital image technology, applied in the field of zero watermarking, can solve problems such as single function

Inactive Publication Date: 2012-09-19
NINGBO UNIV
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  • Description
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Problems solved by technology

[0005] However, the zero-watermarking schemes that have been proposed so far are basically based on the digital watermarking technology of single zero-watermark embedding and extraction, which has the limitation of single function

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  • Method for embedding and extracting multiple zero watermarks of digital image
  • Method for embedding and extracting multiple zero watermarks of digital image
  • Method for embedding and extracting multiple zero watermarks of digital image

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Embodiment Construction

[0097]The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0098] The invention proposes a method for embedding and extracting multiple zero watermarks of a digital image. The watermark embedding and extraction are all carried out in the compound domain of discrete wavelet transform and discrete cosine transform, and the excellent characteristics of both are fully utilized. The main process of multiple zero-watermark embedding is as follows: firstly, perform discrete wavelet transform of appropriate levels on the original digital image, and then perform discrete cosine transform on the obtained wavelet approximation sub-graph, and then according to the resolution of the K binary digital watermarks to be embedded rate, respectively select K groups of DCT AC coefficients that meet the absolute value requirements of a certain difference to form K discrete cosine transform AC coefficient sequences, and fina...

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Abstract

The invention discloses a method for embedding and extracting multiple zero watermarks of a digital image. Multiple zero watermarks are embedded and extracted in a discrete wavelet transform and discrete cosine transform composite domain. The multiple zero watermarks are embedded by constructing a binary watermark secret key by using a coefficient in an original digital image composite domain and then carrying out XOR operation with multiple actual binary digital watermarks, and the multiple zero watermarks are extracted by constructing a binary watermark private key by using a coefficient in a to-be-tested digital image composite domain and combining with zero watermark information. The method has the advantages of excellent watermark robustness and capability of resisting conventional image processing attack; and meanwhile, the method for embedding has the advantages that a plurality of binary digital watermarks are registered in a copyright database without any changing an original digital image, therefore, the embedded binary digital watermarks are not completely detected, the contradiction between the robustness and the difficulty in detection of the digital watermarks is balanced, and multiple requirements of application of the digital watermarks are met.

Description

technical field [0001] The invention relates to a zero watermark technology, in particular to a method for embedding and extracting multiple zero watermarks of a digital image. Background technique [0002] As a technical means to effectively solve the copyright protection and ownership identification of digital media works, digital watermarking is a research hotspot in the field of digital media information security. In order to play its due role, digital watermarking must have two basic elements: robustness and imperceptibility. Watermark robustness means that after the digital media undergoes conventional digital signal processing or external attacks, the embedded digital watermark still has good detectability or can still reflect the copyright information of the original digital media. The imperceptibility of watermark means that the embedding of digital watermark cannot affect the auditory or visual quality of the original digital media, so it will not affect the appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 周亚训金炜陈芬徐星辰郑世超殷丹丹
Owner NINGBO UNIV
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